US Patent 7647499 Apparatus and method for ownership verification

A method and apparatus identifying an item by attaching a radio frequency identification device to the item; obtaining encryption information; generating an encrypted code from the encryption information by a programmer; inserting the encrypted code into the radio frequency identification device by the programmer whereas the encrypted code may be one of a plurality of encrypted codes; attempting to access the radio frequency identification device by a security reader by transmission of another encrypted code to the radio frequency identification device; and responding with a correct access signal by the radio frequency identification device in response to receipt of the other encrypted code if the other encrypted code is same as the inserted encrypted code.